Re: Heater and Vent Work, But not Defrost?
Mine does the same thing and so does my buddy's '85......and while I haven't had time to determine the cause/fix, I'll place my bet on this: Remove your glove box door and you'll see the top of the hvac "box". On top of that is a metal rod attached to a flapper door inside the "box". With your defrost running, actuate that rod with your hand and I'll bet your defrost starts to work. I haven't figured out why the door won't work on it's own (I think it's got to be a bad vacuum line/pod somewhere), maybe you can figure it out and tell me the answer so I can fix mine!
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread
'98 Camaro z28: 370ci twin turbo 370ci build
'01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD
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